Sorry, posted too soon. And I have practised litigation for 20 years. There is no “maybe” about it. It is how lawyers refer to cases in England. Where is “up here”- Scotland? If so, Jim is supposed to have spent his professional life in Scotland so perhaps that is where he might have picked up that way of quoting cases.
(And of course Donoghue v Stevenson actually was a Scottish case, the snail in the bottle in Paisley, so maybe it was a bad example!) But it forms the bedrock of English tort law and I can assure you that it is said as “and”, as is every other case ever cited in English law proceedings.